Ductile Iron Pipe Supports
Ductile Iron Pipe Supports
(OP)
What is the minimum required support for a sanitary sewer ditch crossing?
We have a 15' (at bottom with sideslopes of 2:1) ditch crossing with a 8" DIP sewer main. What concerns do I need to look check...hydraulics of stream or scour, pipe supports detail, length of pipe exposed prior to support, corrosion protection, ???
Site is in Southeast and freeze not a major concern. We could raise the sewer main from 1' above bottom, but can not lower (due to recieving manhole invert).
We have a 15' (at bottom with sideslopes of 2:1) ditch crossing with a 8" DIP sewer main. What concerns do I need to look check...hydraulics of stream or scour, pipe supports detail, length of pipe exposed prior to support, corrosion protection, ???
Site is in Southeast and freeze not a major concern. We could raise the sewer main from 1' above bottom, but can not lower (due to recieving manhole invert).





RE: Ductile Iron Pipe Supports
KRS Services
www.krs-services.com
RE: Ductile Iron Pipe Supports
RE: Ductile Iron Pipe Supports
The pipe will effectively create an obstruction in the flow of the channel, and subsequently, it will have standing water. This water will either evaporate or migrate into the channel soils, which may eventually compromise the material supporting the pipe. A geotech could provide detailed analysis, but I would think that a layer of large fractured face rock with (dry portland) cement sandbags placed under the pipe in the ditch zone would be adequate. One consideration that must be evaluated will be the longterm settlement of the native soils versus the support structure to ensure that differential settling (causing a shear failure in the pipe) of the soils is minimized.
KRS Services
www.krs-services.com